What is an optocoupler Optoisolator its uses and applications?
What is an optocoupler Optoisolator its uses and applications?
An optocoupler (also called optoisolator) is a semiconductor device that allows an electrical signal to be transmitted between two isolated circuits. Two parts are used in an optocoupler: an LED that emits infrared light and a photosensitive device that detects light from the LED.
What is the use of PC817?
PC817 is normally used in embedded project for isolation purposes. In my embedded projects, I place PC817 after Microcontroller Pins to isolate back EMF, in case of motor control etc. PC-817 has several applications e.g. noise suppression in switching circuits, input/output isolation for MCU (Micro Controller Unit).
What is optocoupler and its application?
Optocoupler also called Opto-isolator, photo coupler or optical isolator. Often in circuits, especially low voltage or highly noise sensitive circuits, Optocoupler is used to isolate circuitry to prevent electrical collision chances or to exclude unwanted noises.
How do I choose an optocoupler?
Major selection criteria include, output current IO , supply voltage, CMR (common-mode noise rejection), switching speed, and threshold input current IFHL /IFHL . Developments in IGBT drivers include miniaturization, higher output current, higher-speed switching, and lower power consumption.
What are the advantages of optocoupler?
The main advantages of optocoupler are: one-way transmission of signal, complete electrical isolation between input and output, no influence of output signal on the input, strong anti-interference ability, stable operation, no contact, long service life and high transmission efficiency.
What is difference between optocoupler and optocoupler?
Today we find that both the terms optocoupler and optoisolator are used interchangeably to refer to the same function. The distinguishing feature between these two terms is the amount of voltage being isolated. In all optocouplers and optoisolators, input signals are converted to a pulse of light from an LED.
Why is optocoupler used?
When used correctly, an Optocoupler can effectively: Remove electrical noise from signals. Isolate low-voltage devices from high-voltage circuits. Allow you to use small digital signals to control larger AC voltages.
How many types of optocouplers are there?
four
Optocouplers are available in four general types, each one having an infra-red LED source but with different photo-sensitive devices. The four optocouplers are called the: Photo-transistor, Photo-darlington, Photo-SCR and Photo-triac as shown below.
What is optocoupler and its advantages?
What is the basic principle of operation of an optocoupler?
The basic working principle of Optocoupler is the output of the electrically isolated circuit is controlled by varying the input of the circuit. Input is given to the Infra red LED by a voltage source, the intensity of the voltage source is adjusted by varying the input voltage.
What is the working of optocoupler?
An Optocoupler can do the job. Let there be light! This device allows you to transmit an electrical signal between two isolated circuits with two parts: an LED that emits infrared light and a photosensitive device which detects light from the LED.
What is difference between optocoupler and opto isolator?
When to use PC 817 or pc817 optocoupler?
In protection like electric isolation, PC 817 is reliable to use due to its functionality. PC817 is much efficient in switching for microcontrollers. Simple transistors can be used but due to its neglecting the noise factor the optocoupler can be used as switching too.
How much voltage can an opto coupler handle?
In present commercial market, we can buy Opto-coupler with 10 kV to 20 kV input to output withstand voltage capacity, with a specification of 25 kV / uS voltage transients. This the internal structure of the opto-coupler.
Which is an example of a TRIAC based opto-coupler?
Here is one Triac Application. The photo-TRIAC based opto-coupler examples are IL420, 4N35 etc are example of TRIAC based opto-coupler. SCR stand for Silicon controlled rectifier, SCR also referred as Thyristor.
How is the optocoupler used in signal isolation?
In signal Isolation, the optocoupler is faster and widely used from the previous century. Optocoupler is also used for a basic noise coupling circuit to keep the circuit in use without any disconnectivity. Nowadays IC has the best uses in IoT devices for switching and zero cross.